K1NG

I own two 1 gen rx7s and i don't what kind of ignition system to use in them. They are dual points. So instead of srewing up both of them I thought I'd ask all of you. So if any of you have any suggestions I would be grateful.


Thank You,

Jonathan

dbragg

iTrader: (7)

search

vipernicus42

iTrader: (4)

Here's some search material to narrow things down:

Search Item - Description
DLIDFIS - "Dual Leading Ignitor Direct Fire Ignition System". Using 3 coils and 2 ignitors you rig up a direct-fire system where the leading plugs each have their own coil and fire directly from it.

2GDFIS - "2nd Gen Direct Fire Ignition System". Using a 2nd Gen Leading coil you fire both leading plugs at the same time in a wasted-spark configuration from the 2nd Gen coil directly. The 2nd Gen coil is fired directly from your 1st Gen igniter, possibly causing a loss in power compared to how it would run on a 2nd Gen

Transistor Trick - A small electric box that was produced for a short period of time here on the forum which allowed you to fire the 2nd Gen igniter with a conditioned signal from your 1st Gen igniter. Upside: The 2nd Gen ignitor provides a bigger "boost" compared to the weak J109 first gen ignitor does, so you get the full performance intended for the 2nd gen ignition. Downside: There was a delay they couldn't eliminate and an overheating problem that caused premature coil failure. I don't know if they managed to work a way around it.

MSD - "Multiple Spark Discharge", also the name of the company. MSD makes ignition boxes which fire multiple times during the course of combustion. They say it does wonders to improve performance, but for the price nobody's really sure. Since Leading plugs can be fired in a wasted spark config, you can use one MSD for the leading, but you have to either leave the trailing stock or buy two more MSD boxes for the trailing. Since trailing is only useful for emissions control anyway, most people don't bother going all the way... Unless of course you're crazy and loaded with more money than you can shake a stick at... Or you're Directfreak.

Aftermarket computers such as Megasquirt - These aftermarket computers are used mostly for fuel injection control purposes in 2nd Gens, but since they have spark control it's possible that you can build a Megasquirt box and run some 2nd gen coils off it the way you would with a 2nd Gen, and just not use any of the fuel control parts of the box. You'd also need a 2nd Gen CAS to give signals to the ECU so that it knows what angle it's at.


I'm still waiting for someone to make an ignition-only controller. Just a controller that would allow you to put in a 2nd Gen CAS, mount a 2nd Gen Leading and Trailing coil, hook it all up, and load maps. Hell, even if it couldn't load maps, as long as it knew what to do for the stock setup that's fine by me!


Remember that any of these solutions which go "Direct Fire" should be used with "Direct Fire" plugs, like the stock 2nd Gen spark plugs.

Have fun searching. There's a metric ton of information around here, scattered in little bits for ya. Check the Archive, might be some good DLIDFIS stuff there. Just sort by thread name and look for "Ignition"

Jon

Booyah

wish there was an easy DLIDFIS install/write up thread. I must be too retarded to find it.

jfachner72

Hey Jon,

Please offer me some more info on the 2nd Gen Coil set up. I did this mod about 2-3 months ago and didnt read anywhere about the difference in plugs. I consider myself fairly mechanical and I am not sure whet the difference is between the 2 plugs.

So that said I am running stock plugs in my leading and trailing spots. I have not noticed any problems over the last few months.

Thanks
Jason

K1NG

Thank you vipernicus42 for the info. I have heard about DLIDFIS and MSD ignitions. The others where new and interesting. but seem out of my skill range.

Rx-7Doctor

iTrader: (13)

Jason,
Get the stock leading plugs for the 86-92 N/A engine and use those instead of the 1st gen plugs.
For the trailing side, just use the stock 1st gen plugs.

Booyah, You Damn Newbie. It's in the Archive section,lol.

Rx-7Doctor

iTrader: (13)

Jonathan,
In the archives there is a thread that will show you how to convert your system over to the electronic ignition.
Once you do that you can upgrade from there. You will need a Dist out of a 81-85, anyyear or model.

K1NG

Thanks RX-7DOCTOR swicthing from points to electronic alone would help

Siraniko

iTrader: (13)

I just have to disagree. I used regular NGK FB sparkplugs including autolite race plugs with no issues. So now, "please" explain it why it wont work.

Rx-7Doctor

iTrader: (13)

No one said it won't work!

We are recommending that you use the 2nd gen plugs for the leading side when you do the upgrade. I have noticed better MPG with the 2nd gen plugs. Performance wise, I did not do a comparison.

Siraniko

iTrader: (13)

Then why use "should' and "instead".

Rx-7Doctor

iTrader: (13)

How about "Recommend". Are you happy now you Old Fart!

Siraniko

iTrader: (13)

mucho bueno senor. I just wanna make sure that we dont post inaccurate information.

kgray

IMHO, two MSD 6al's firing a 2nd gen coil for the leading coil and blaster 2 for the trailing. NGK FTW!

vipernicus42

iTrader: (4)

I can't remember details, but when I read up on the ins and outs of resistor-type spark plugs vs. the other type, I remember reading a lot about how one set of plugs is specifically designed for distributor-driven systems and the other type is specifically designed for direct-fire systems.

Edit... nevermind, the site doesn't have good info anymore

Jon

jfachner72

Well based on Jon's input I am going with the BUR7EQ plugs. (7.68 a piece my cost) I guess thats not too bad since I have not changed to old ones in 23,000 miles.

Thanks for the insight
Jason